Grinding-machine.



No. 673,|32. Patented Apr. 30, 1901. W. C. BRUCE &. G. H. DIPPO.

GRINDING MACHINE.

(Application filed Dec. .21, 1899.,

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W j? OQ No. 673,82. Patented Apr. 30, IQOI. W. C. BRUCE & G. H. DIPPO.

enmnme MACHINE.

(Application filed Dec. 21, 1899.)

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(No Model.)'

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UNTTEE STATES PATENT OFFICE.

WILLIAM C. BRUCE AND GEORGE I-I. DIPPO, OF OIIAGRIN FALLS, OHIO, ASSIGNORS TO THE FERROSTEEL COMPANY, OF CLEVELAND, OHIO.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 673,132, dated April 30, 1901.

Application filed December 21, 1899. Serial No. 741.099. (No model.)

To all whont it may concern.-

Be it known that we, WILLIAM C. BRUCE and GEORGE H. DIPPo, citizens of the United States, residing at Chagrin Falls, county of Ouyahoga, and State of Ohio, have invented a new and useful Improvement in Grinding- Machines, of which the following is a specification, the principle of the invention being herein explained and the best mode in which we have contemplated applying that principle, so as to distinguish it from other inventions.

Our invention relates to that class of machines designed to grind fiat surfaces, and particularly the flat surfaces of sad-irons; and said invention consists of means hereinafter fully described.

The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings, Figure I represents a vertical axial section of the rotary table and the grinding wheels in elevation. Fig. II represents a top plan of our improved device.

A table A is horizontally mounted upon a shaft in suitable bearings and is provided with a bevel-gear A upon its under side, Fig. I, which meshes with a bevel-pinion B, mounted upon a shaft driven by a pulley C. The upper side of the rim portion a, of said table is provided with a series of depressions a, having a contour corresponding with a horizontal section of a sad-iron and into which the sad-irons are placed and secured against longitudinal or transverse displacement while so located.

Upon a suitable standard D is mounted a vertical spindle E, upon the lower end of which is secured a grinding-wheel E, having an annular grinding-surface 6 parallel with the plane of rotation of said table and so located with reference to the latter that any line or lines drawn through the said depressions and perpendicular to said plane of roiation may be caused to pass through said grinding-surface by rotating said table. Said grinding-wheel is caused to rotate rapidly by means of a belt and pulley, as shown in Fig. I, and suitable mechanism is provided to raise and lower the grinding-surface, so as to approach or retract from the table. A similar standard and grinding-wheel are similarly mounted diametrically opposite the grinding-wheel E and operate in the same manner.

Projecting into the interior of each annular grinding-ring is a stand F, Fig. I, which projects over the line of travel of the sadirons and to which is attached a springf of a length such that it will successively engage the upper surface of each sad-iron as it passes into the interior of the annular ring and is temporarily free from contact with the grinding-surface.

On each outer side of each grinding-ring and also located above the line of travel of the irons is a similarspring f and f respectively, which contacts the iron before and after contact with the grinding-surface, these springs being shown in dotted lines in Fig. II.

By the use of the above-described springs the irons are prevented from tipping up and being ejected from the recesses on the beginning of the contact of their extremities with the grinding-surfaces or upon leaving such surfaces.

By the use of a horizontal table it is seen that no securing of the sad-irons is required further than that afforded by the lateral walls of the depressions in preventing longitudinal or lateral displacement by contact only. The ground sad-irons may be hence easily removed or replaced by those unground and the speed of the machine, and hence the output of the material, increased.

The grinding-surface being a plane sun-face and the sad-irons also traveling in a plane, an absolutely plane ground surface is always secured.

Other modes of applying the principle of our invention may be employed instead of the one explained,change being made as regards the mechanism herein disclosed, provided the means covered by any one of the following claims be employed.

We therefore particularly point out and distinctly claim as our invention-- l. The combination with a rotary table provided near its rim portion with means for secu ring sad-irons, of a grinding-surface parallel with the plane of rotation of said table,lines perpendicular to said plane of rotation intersecting said grinding-surface, and means independent of the table to successively contact with the upper surface of each sad-iron, whereby the removal of the sad-irons from the table is prevented, substantially as set forth.

2. The combination with a horizontal rotary table, provided near its rim with a series of depressions constituting the securing means for sad-irons, of a rotating annular grinding-surface parallel with the plane of. rotation of said table, and a device within the annular grinding-surface provided with means for successively engaging the upper surface of each sad-iron, whereby the irons are prevented from being ejected from the said depressions, substantially as set forth.

3. The combination of a rotary table, a rotating grinding-surface parallel with the plane of rotation of said table, a series ofdepressions in the rim portion of said table, and a spring device for engaging the upper surface of each sad-iron at the beginning and near the end of contact of the grinding-surface with said upper sn rface, substantially as set forth.

Signed by us this 17th day of June, 1899.

WILLIAM CL BRUCE. GEO. H. DIPPO. Attest:

D. T. DAVIES, N. E. MERKEL. 

